Adding to a list in a Parallel.ForEach loop in a threadsafe manner

Question

I have a bit of code that works like this on a list of obj objects called ListofObjects:

List NewListofObjects();

Parall         


        

Answer 1

You can use the locking block like the following code to insert items into your list in a thread-safe manner.

var sync = new object();
var myNewList = new List();
Parallel.ForEach(myListOfSomethings, a =>
    {
        // Some other code...
        var someObj = new SomeObject();
        // More other code...
        lock(sync)
        {
            myNewList.Add(someObj);
        }
        // Even more code...
    });